When the bodies are found Red John's symbol is placed on the side wall. This means it is not visible unless they turn to see it after looking directly at the dead bodies. For continuity, per the Pilot (2008) episode, the symbol should have been placed on the tile above them or on the door to the bathroom. This is a critical detail that does not change over the run of the series.
At 19:57 just after Minelli places the team on suspension the camera pans over a city. The series takes place in Sacremento, but the city shown is Pittsburgh.